Pull action_log into its own crate (#35959)

Release Notes:

- N/A

crates/assistant_tools/src/read_file_tool.rs

@@ -1,6 +1,7 @@
 use crate::schema::json_schema_for;
+use action_log::ActionLog;
 use anyhow::{Context as _, Result, anyhow};
-use assistant_tool::{ActionLog, Tool, ToolResult};
+use assistant_tool::{Tool, ToolResult};
 use assistant_tool::{ToolResultContent, outline};
 use gpui::{AnyWindowHandle, App, Entity, Task};
 use project::{ImageItem, image_store};
@@ -286,7 +287,7 @@ impl Tool for ReadFileTool {
                         Using the line numbers in this outline, you can call this tool again
                         while specifying the start_line and end_line fields to see the
                         implementations of symbols in the outline.
-                        
+
                         Alternatively, you can fall back to the `grep` tool (if available)
                         to search the file for specific content."
                     }